'''Piano Sonata No. 16 in C major''', K. 545, by Wolfgang Amadeus Mozart was described by Mozart himself in his own thematic catalogue as "for beginners," and it is sometimes known by the nickname '''''Sonata facile''''' or '''''Sonata semplice'''''.
Mozart added the work to his catalogue on June 26, 1788, the same date as his Symphony No. 39. The exact circumstances of the work's composition are not known, however. Although the piece is well-known today, it was not published in Mozart's lifetime and first appeared in print in 1805. A typical performance takes about 14 minutes.